Ethical or Moral relativism is very fashionable in many modern societies. But there are serious problems with this approach. In the end, attempting to answer or refute this position is a huge waste of time, an annoying digression from the serious topics. If you want to explore these ideas, I suggest a look at these two short books: A Refutation of Moral Relativism by Peter Kreeft Ethics: A Very Short Introduction by Simon Blackburn